The Company and Summary of Significant Accounting Policies - Additional Information (Details)				12 Months Ended		19 Months Ended
	Nov. 25, 2019 USD ($) $ / shares shares	Nov. 06, 2019	Oct. 16, 2019 $ / shares shares	Dec. 31, 2019 USD ($) Distributor Customer $ / shares shares	Dec. 31, 2018 USD ($) Distributor Customer $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Significant Accounting Policies [Line Items]
Stock split			30,000-for-1
Common stock, shares authorized | shares			200,000,000	200,000,000	200,000,000	200,000,000
Common stock, par value | $ / shares			$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
Reverse stock split		2-for-3
Fair value, assets, level 1 to level 2 transfers, amount				$ 0	$ 0	$ 0
Fair value, assets, level 2 to level 1 transfers, amount				0	0	0
Fair value, liabilities, level 1 to level 2 transfers, amount				0	0	0
Fair value, liabilities, level 2 to level 1 transfers, amount				0	0	0
Allowances for doubtful accounts				100,000	$ 200,000	100,000
Finance leases				$ 0		$ 0
Exercise restriction at the time of vesting					1 year
Earnings per share, potentially dilutive securities | shares				0	0
Restricted Stock Units RSU
Significant Accounting Policies [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period | shares				3,012,399
Restricted Stock Units RSU | MegaChips
Significant Accounting Policies [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period | shares						0
Selling, General and Administrative Expenses
Significant Accounting Policies [Line Items]
Advertising expenses				$ 300,000	$ 200,000
Purchased Intangibles with Finite Lives
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets				3 years
Revenue | Credit Concentration Risk
Significant Accounting Policies [Line Items]
Number of distributors representing more than 10% of company's revenue | Distributor				3	3
Concentration risk, percentage				10.00%	10.00%
Accounts Receivable | Credit Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, customer				At December 31, 2019 and 2018, three customers accounted for 10% or more of accounts receivable
Number of customers | Customer				3	3
Level 1
Significant Accounting Policies [Line Items]
Cash balances in bank				$ 28,400,000	$ 7,900,000	$ 28,400,000
Highly liquid money market funds				35,000,000		35,000,000
Other Assets
Significant Accounting Policies [Line Items]
Deferred offering costs				$ 0	$ 0	$ 0
Initial Public Offering
Significant Accounting Policies [Line Items]
Issuance of common stock upon initial public offering net of underwriting discounts and commissions and other offerings costs, Shares | shares	4,945,000
Shares issued price per share | $ / shares	$ 13.00
Proceeds from public offering, net of underwriting discounts and commissions	$ 56,400,000
Payments for underwriting discounts and commissions	7,900,000
Deferred offering costs	3,400,000
Deferred offering costs reclassified into stockholders' equity	$ 3,400,000
Over-Allotment Option
Significant Accounting Policies [Line Items]
Issuance of common stock upon initial public offering net of underwriting discounts and commissions and other offerings costs, Shares | shares	645,000
MegaChips | SiTime Corporation
Significant Accounting Policies [Line Items]
Percentage of outstanding common stock held				66.80%		66.80%
Minimum
Significant Accounting Policies [Line Items]
Revenue Recognized Payment Terms				30 days
Minimum | Capitalized Internal Use Software
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets				2 years
Minimum | Accounts Receivable | Credit Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, percentage				10.00%	10.00%
Maximum
Significant Accounting Policies [Line Items]
Foreign currency remeasurement and transactions gains and losses				$ 100,000	$ 100,000
Warranty reserve balances				$ 100,000	$ 100,000	$ 100,000
Revenue Recognized Payment Terms				60 days
Revenue recognized amortization period term				1 year
Maximum | Capitalized Internal Use Software
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets				3 years